and remarks on the Genus Papilio. 415 



P. Tubnus, Larva apple-green. Head flesh-color with a yellow 



colar. Ocellus with yellow iris and a double blue 

 pupil. Between the Uh and 5th segments a double 

 tranverse band, yellow and black. 

 B. Spinose. 



P. Philenor, . . . . Larva brown with two lateral series of small reddish 

 tubercles and spines. 



On examining the above analytical tables, and comparing them 

 with that showing the food-plants of the Larvae, it will be seen that 

 this extensive genus is naturally divided into various groups, char- 

 acterized not only by peculiarities in the colors of the wings and 

 structure of the Larvae, but also by their geographical distribution 

 and pabulum. 



The Larvae of the group represented by P. Asterias, feed exclu- 

 sively on plants of the order Umbelliferce (such as Parsley, Poi- 

 son Hemlock, Carrot, &c.,). The species occur in Europe, Asia, 

 Africa and America. This may be regarded as the typical 

 group. 



P. Thoas is the largest North American species. It repre- 

 sents a rather large and very natural group, almost peculiar to 

 South America. The species all feed on plants of the genus citrus 

 (such as Orange, Lemon, &c.,). This species was formerly consi- 

 dered as belonging exclusively to the Southern States, but ac- 

 cording to Prof. Kirtland it occurs in Ohio, feeding there, how- 

 ever, on Xanthoxylum (Hercules Club and Prickly Ash). 



P. Polydamas forms with some South American species a small 

 but very natural group ; they feed on plants of the genus Aristo- 

 lochia (Pipe Vines). This is the only North American species 

 without tails to the posterior wings, and the tentacular organ on 

 the head of the of the Larva is brown, whilst in the other species 

 it is yellow or orange. 



P. Ajax, Marcellus and Sinon, bear a great resemblance to 

 each other in the perfect state, though not in the Larva. They 

 feed in America on plants of the order Anonacece or Custard Ap- 

 ples (such as Acimina triloba, North American Papaw, &c.,). 

 This group is represented in Europe by P. podalirius. 



P. Calchas and Troilus have very similar larvae. They feed on 

 plants of the genus Laurus (such as the Spice-bush, Sassafras, 

 &c.,). P. Calchas is not unlikely to occur in Canada West. 



P. Glaucus and Turnus are closely allied both in the Imago 

 and Larva, the ground color of the wings of the first, however, is 



